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Homework Help: Calculate Heat loss without k (thermal constant)

  1. Apr 6, 2012 #1
    1. The problem statement, all variables and given/known data

    An 16m by 9.0m house is built on a concrete slab 20cm thick. What is the heat-loss rate through the floor if the interior is at 29°C while the ground is at 19°C?


    Area = 16*9 = 144m^2
    DeltaX = 20cm = 0.2m
    DeltaT = 29-19 = 10°C

    k = not given

    H = ?

    2. Relevant equations

    Equation (i believe): H = (-k*A*DeltaT)/DeltaX

    3. The attempt at a solution

    I calculated the heat loss with the above given details but apparently the answer does not depend on the variable k (thermal conductivity).

    Anyone got any ideas?
  2. jcsd
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